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Major League Baseball Professional Baseball Organization Championships

Major League Baseball (MLB) is a professional baseball organization It is the oldest of the major professional sports leagues in the United States and Canada. A total of 30 teams play in Major League Baseball: 15 teams in the National League (NL) and 15 in the American League (AL). The NL and AL were formed as separate legal entities in 1876 and 1901, respectively. Beginning in 1903, the two leagues cooperated but remained legally separate entities. In 2000 the leagues merged into a single organization led by the Commissioner of Baseball.

MLB also oversees Minor League Baseball, which comprises 256 teams affiliated with the major league clubs. MLB and the World Baseball Softball Confederation jointly manage the international World Baseball Classic tournament.
The 1950s and 1960s were a time of expansion for the AL and NL, then new stadiums and artificial turf surfaces began to change the game in the 1970s and 1980s. Home runs dominated the game during the 1990s, and media reports began to discuss the use of anabolic steroids among MLB players in the mid-2000s.
Today, MLB is composed of 30 teams: 29 in the United States and 1 in Canada. Teams play 162 games each season and 5 teams in each league advance to a four-round postseason tournament that culminates in the World Series, a best-of-seven championship series between the two league champions that dates to 1903. Baseball broadcasts are aired on television, radio, and the Internet throughout North America and in several other countries. MLB has the highest season attendance of any sports league in the world with more than 69.6 million spectators in 2018

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